Update png requirement from 0.15 to 0.16 (#146)

Updates the requirements on [png](https://github.com/image-rs/image-png) to permit the latest version.
- [Release notes](https://github.com/image-rs/image-png/releases)
- [Changelog](https://github.com/image-rs/image-png/blob/master/CHANGES.md)
- [Commits](https://github.com/image-rs/image-png/compare/v0.15.0...v0.16.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2020-03-02 08:54:20 +01:00 committed by GitHub
parent 882e7bc7ad
commit 9d5529422c
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@ -20,7 +20,7 @@ exclude = [
maintenance = {status = "actively-developed"}
[dev-dependencies]
png = "0.15"
png = "0.16"
[build-dependencies]
cc = "1.0"